ok so according to what i read i'll try to explain it simply Suppose we have a computer that has files named with letters a0,b0,c0,d0,e0 (ill assume it's 5 files, and the 0 show's it's the first version of the file, and ill increment that number every time it gets modified) We will perform a full backup and suppose it's on day0, now so we have a backup that has all those files(a0,b0,c0,d0,e0)
*Day1*, files b and e were modified. Current files on system:a0,b1,c0,d0,e1 *incremental backup*:will backup only the new b1 and new e1 *files included in incremental backup*: b1,e1 *differential backup*: at this same point will do exactly the same (i'll explain why later) *files included in differential backup*:b1,e1 ---- *Day2*, files a,b were modified, Current files on system:a1,b2,c0,d0,e1 *incremental backup*:we will backup the new changes compared to the most recent backup (the one on day1) *files included in incremental backup*:a1,b2 (e1 remains unchanged so no need to include it) *differential backup*:we will backup the new changest compared to the most recent *FULL* backup (the one on day0) *files included in differential backup*: a1,b2,e1(any thing that is *different *since last full backup (a0,b0,c0,d0,e0) ---- *day3*, files c,e were modified Current files on system: a1,b2,c1,d0,e2 *incremental backup*: since last backup (day2) we have only c1,e2 with changes *files included in incremental backup*: c1,e2 *differential backup*:the only file that we wont include here is d0 because it never changed (since last *FULL* backup) but all other files have. *files included in differentcial backup*: a1,b2,c1,e2 * ---- *So i think by now you should be getting the picture how things work, now if we want to look at advantages and disadvantages of each. Incremental backup: *Adv*. You might have noticed already, the number of files we included in the backup every day was minimum, so we could say that it has fast back up times and also saves hard disk space (compared to both full and differential backups) *Dis*. Now if i need to restore the files, ill need all backups since the last full backup till the day i want to restore to, so if i want to restore to day5 for example, i need day0,day1,day2,day3,day4,day5 backups Differential backup: now if i need to restore using differential backups, using same assumptions (a restoration to day5) we will only need the backups day0 and day5 only. *Adv*. fast restoration time *Dis**, *slower backup time (compared to incremental, but it's still faster than a full backup) because as we see at day2 i was backingup 3 files and at day3 it became 4 files, and it will increasing the further i become to the last full backup (day0) ps. about day0, the both backups were the same because the reference point was the same (day0), incremental backups' reference point changes every day (assuming daily backups) to most recent backup, but differential backups' reference point stays the same to most recent FULL backup, it will only change if you perform a full backup on any day Hope i was able to explain this good enough.. ~Coalwater~ On Sat, Jan 16, 2010 at 1:05 PM, Ka dadi <[email protected]> wrote: > Hi Team, > > Can someone put to me in plain English the difference between Incremental > and Differential Back-up ? I read and read, and as soon as I think I > understood, I lose it again! > > Ka_dad > > -- > You received this message because you are subscribed to the Google Groups > "Computer Tech Support" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<computer-tech-support%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/computer-tech-support?hl=en. > >--
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