> These are conservative stats. The customer I'm adminning TSM for right > now got one of last night's information store backups (of 82.8GB) in > 8440 seconds--almost 10MB/sec--on a 10/100 network.
My Exchange backup last night was 65.9GB in 1537 seconds (that's about 40 MB/s over a 1Gb/s network and with LTO G2 drives); that's being written directly to a sequential tape pool without an intervening random access pool. We back up Exchange direct-to-tape because the backup objects are very large (our largest store is 57GB) and I don't want the large backup objects (the largest is 57GB) clobbering my random access pool. > I would not bother with differential backups. One full backup per day, > with perhaps an incremental backup 12 hours after the full, would > guarantee a maximum of 12 hours of data loss in the event of a > catastrophe and subsequent restore. (Of course, you could do a daily > full, and incrementals at 8 and 16 hours after the backup, for even > greater minimization of data loss.) I would agree with that as well. We do a single full backup once a day. The only reason I would use differentials is if I were backing up over a slow link. Kelly
