Well, I have found that to keep the prices down (IOW, keep your wallet from going nuclear), it would probably be best to get several of the smaller drives (like 4TB) and then raid them together . This will not only allow you a larger filesystem, but also increased performance. Striping raid is best for performance, while mirroring allows for complete redundant backup with a CRC failover. I have several 3 TB externals. Here all in raid 1 (striping), which gives me an effective 12 TB external with the max performance bandwidth that USB 3 can provide (it’s not as fast as the 3GPS SATA drives, but it’s more than fast enough).
Now, there are three methods of raid you need to be aware of (2 of which I just mentioned): 1. Striping 2. Mirroring 3. Concatenation The third one above simply allows you to append 1 drive to another. This is also the easiest method to use if you simply want to add more drives to the raid. It doesn’t have the performance of striping or the redundancy of mirroring, but as a simple large drive, it works ok. Basically, it’s up to you what you want to use. Just bear in mind, none of the above solutions is for the newbie. A bit of reading will be required. -Eric > On Dec 16, 2018, at 2:49 AM, Ramy Moustafa <ramy.moustaf...@gmail.com> wrote: > > Aha i understand now. > but all my external HDs will be more than 4 TB, and i will not be able to buy > 8 TB HD. > All my data now are 8 TB storage, so, must i buy 16 TB hard drive? > so, what will be teh 2nd solution? > > >> On Dec 14, 2018, at 4:31 PM, 'Tim Kilburn' via MacVisionaries >> <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com>> >> wrote: >> >> Hi, >> >> No, it can be just one backup volume. First limitation is that the backup >> volume should be about twice as big as the data being stored. So, if you >> have less than 2 TB of data that needs backed up, then a 4 TB Time Machine >> backup volume is perfect. If the total is greater than that, you might be >> fine, but the backup may run out of space too quickly. All that out of the >> way, you just go into your Time Machine pane in System Prefs, press the >> Options button and make sure that none of your external drives are excluded >> from the backup. Essentially, that's all you need to do. Leave all drives >> connected all the time and let Time Machine do its thing automatically. >> Note that the first backup may take days as the data is being prepared for >> and backed up to the new drive. All subsequent backups should be much >> faster. >> >> Later... >> >> Tim Kilburn >> Apple Teacher >> (with Swift Playgrounds Recognition) >> Fort McMurray, AB Canada >> >> On Dec 14, 2018, at 06:32, Ramy Moustafa <ramy.moustaf...@gmail.com >> <mailto:ramy.moustaf...@gmail.com>> wrote: >> >> >> >> My friends: >> I finally got 4 tb hard disk, that i plan to use it for weekly backup, >> I have more than 3 hard disks that i hope to backup them on this hd, so, >> must i divide this new hd to 3 volumes to use time machines? >> or what is the best thing? >> Thanks for helping.Ramy moustafa saber >> licturer at: >> faculty of musical education >> music arranger and sound engineer >> Sent from my iPhone >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. 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You can reach mark at: >> mk...@ucla.edu <mailto:mk...@ucla.edu> and your owner is Cara Quinn - you >> can reach Cara at caraqu...@caraquinn.com <mailto:caraqu...@caraquinn.com> >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >> <http://www.mail-archive.com/macvisionaries@googlegroups.com/> >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to macvisionaries+unsubscr...@googlegroups.com >> <mailto:macvisionaries+unsubscr...@googlegroups.com>. >> To post to this group, send email to macvisionaries@googlegroups.com >> <mailto:macvisionaries@googlegroups.com>. >> Visit this group at https://groups.google.com/group/macvisionaries >> <https://groups.google.com/group/macvisionaries>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. 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