Obviously, the snapshot above is done after the loop (for some reason the forum 
ate up my indentation). Anyway, I increased swap to 8G, and here's some more 
info, after the backup taken last night (which went just fine):

***********************
BEFORE the backup:
***********************

(from "top -b -o size")
42 processes: 41 sleeping, 1 on cpu
CPU states: 99.5% idle,  0.0% user,  0.5% kernel,  0.0% iowait,  0.0% swap
Kernel: 197 ctxsw, 9 trap, 423 intr, 339 syscall, 9 flt
Memory: 3551M phys mem, 2491M free mem, 8192M total swap, 8192M free swap

***********************
After the backup
***********************

top -b -o size
last pid: 11155;  load avg:  0.00,  0.02,  0.06;  up 0+22:25:19        12:59:40
42 processes: 41 sleeping, 1 on cpu
CPU states: 99.5% idle,  0.0% user,  0.5% kernel,  0.0% iowait,  0.0% swap
Kernel: 187 ctxsw, 9 trap, 428 intr, 327 syscall, 9 flt
Memory: 3551M phys mem, 491M free mem, 8192M total swap, 8192M free swap

   PID USERNAME NLWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
   433 root       19  59    0   23M   12M sleep    0:03  0.00% fmd
   220 root       23  59    0   23M 8640K sleep    0:06  0.00% nscd
   360 daemon      6  59    0   20M 8980K sleep    0:09  0.00% idmapd
     7 root       12  59    0   18M   10M sleep    0:07  0.00% svc.startd
...

and from mdb (echo ::memstat | mdb -k)

Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     240134               938   26%
ZFS File Data              517533              2021   57%
Anon                        20378                79    2%
Exec and libs                1314                 5    0%
Page cache                   5248                20    1%
Free (cachelist)             8561                33    1%
Free (freelist)            113886               444   13%

Total                      907054              3543
Physical                   907053              3543

Which makes me worry some more, since ZFS has already "eaten up" 57% of the 
memory. 

Will keep monitoring every day, and report back if/when disaster strikes 
again...
-- 
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