-now=$(date +%s)
-age_limit_sec=$(( 60 * 60 * 50 )) # 50 hours
-for vol in {root,boot}_ubuntubionic; do
- snaps=(/mnt/r7/amy/btrbk/${vol}.20*)
+age_limit_sec=$(( 60 * 60 * 24 * 7 )) # 7 days.
+for prefix in root boot; do
+ if [[ $prefix == boot ]]; then
+ # its not uncommon for the /boot subvol to have no changes, and thus
+ # no new backups for 10 days or so. todo: instead of this error
+ # prone check, we should make it so the ziva computer will
+ # touch a file on our computer whenever btrbk succeeds
+ age_limit_sec=$(( age_limit_sec + 60* 60 * 24 * 35 ))
+ fi
+ vol=${prefix}_ubuntubionic
+ snaps=(/mnt/r7/amy/$prefix/btrbk/${vol}.20*)