I bought the above NAS in October of last year and it seemed to work fine with Time Machine. However since December of last year I'm regularly getting the following message (attached). I'm using Lion 10.7.3 and Synology DSM 3.2-1955. All connections during backup are through Gigabit ethernet. The Time Machine volume on the NAS resides on 2 Disks formatted to SHR with no other use. The physical disks are compatible with the NAS. I logged a ticket with Synology with a data dump of the NAS for them to look at but they came back to me saying that it is a known issue with Macs and that I should try and use Disk Utility to fix the available backups. This was a non-starter so I was wondering if anyone else has had similar issues recently and if they had a better solution. Alternatively can anyone recommend a backup solution other than Time Machine that works with a NAS ?