Backup storage hot swap

Hello everyone!

My problem is simple. I need a NAS or similar with two or more single bay for SATA HDD with hot swap.
The purpose is to do backups from a server, at night. One time a week, or wathever, someone swaps one HDD and take it home (so we have several backups in different geographical places).
The main problem i found in my search over available NAS:
- no led that indicates disk activity, so a user can know its safe to do the swap
- no case free, that means the HDD must be attached to some kind of specific bay.

best regards

This is an option to build it yourself:

1 Rosewill R223-P-BK 120mm Fan ATX Mid Tower Computer Case - Retail
$19.99 $19.99
1 GIGABYTE GA-EP43-UD3L LGA 775 Intel P43 ATX Intel Motherboard - Retail
$79.99
1 Antec earthwatts EA430 430W Continuous Power ATX12V v2.0 80 PLUS Certified Active PFC Power Supply - Retail
$59.99
1 Intel Celeron 430 Conroe-L 1.8GHz LGA 775 35W Single-Core Processor Model BX80557430 - Retail
$37.99 $37.99
1 Kingston 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model KVR800D2N6/1G - Retail
$14.99 $14.99
1 OS FreeNAS
$0.0 $0.0
1 OS OpenFiler $0.0 $0.0
1 SAMSUNG Spinpoint F3EG HD203WI 2TB 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
$179.99
3 Optional Part: iStarUSA T-5-SA 1x5.25" Bay Trayless Anti-vibration SATA Mobile Rack - Retail $14.99 $44.97

Total (with Mobile Racks) 437.91