I've modified the amanda.conf in the following way for my backup scenario (I want to backup only weekdays, I have 16 Tapes).
###
dumpcycle 7 days runspercycle 5 days #only weekdays. I run amdump only Mo-Fr tapecycle 16 tapes #I have 16 tapes runtapes 1 # one tape is used for every run
bumpsize 20 Mb # minimum savings (threshold) to bump level 1 -> 2
bumpdays 1 # minimum days at each level
bumpmult 4 # threshold = bumpsize * bumpmult^(level-1)
etimeout 300
holdingdisk hd1 {
comment "main holding disk"
directory "/cache" # where the holding disk is
use -30 Mb # how much space can we use on it
}
reserve 40 # percent
###
I will label my tapes daily01-16.
My Dell PowerVault 122T has an auto-changer with 8 slots for 8 tapes, so I need to change only once in the 3 weeks period.
Am I right?
Thanks a lot, ddaas
<>How valuable is your data? The absolute minimum is 1 tape, overwrite it <>each day. Or runs/cycle, overwrite some of your last valid backup each day. <>Or runs/cycle + 1, "theoretically", never overwrite only valid copies "ever". <>Unless, of course, one of the tapes is bad and you don't realize it.
<>Do you want more safety? Do you ever want to recover something more than a <>week old? Then you need more tapes. How many more? Your data, your budget. <>Myself I feel comfortable with several weeks worth of backups (3-4 for me). <>Independent of full system archives that are a different config. YMMV.
<>As you have outlined your requirements, your dumpcycle is NOT 5, it is 7. <>Think of dumpcycle as "how often do you want a full backup?" and set it <>accordingly. If you want a full backup once a week set it to 7 days. <>A full backup every other day; Set it to 2 days. Note, there is a unit <>applied to dumpcycle.
<>Runs/cycle is simply how many times (no units) you expect to run amdump <>during any dumpcycle. You said no weekends, so if your dumpcycle is 7, <>and you do amdumps weekdays, runs/cycle is 5, there are 5 weekdays in <>every 7 days. Mine are 7 days and 6, I skip Sunday, collecting the <>weekend changes in Monday's (2AM) backup.
