Errors with Acronis Workstation 9.1

Hi,
I have some problem with the version Workstation 9.1 build 3.694
1- In one pc I created a task to make a full backup, without excluding specific files, but after about ten
minutes I receive the error E00070021: Can not access the drive.
The operating system is Windows XP SP2.
The hard disk is a SATA SSD Intel X25-M 80GB. This version of Acronis is compatible with SSD?

2- In another pc I created the same previous task but the copy isn't made and this is the log of the operation:

<?xml version="1.0" encoding="UTF-8" ?>

Crea archivio immagine Completo</bold><endl/><tabpoint value=30><indent value=4>Da: <indent value=10><textcolor value="navyblue">NTFS (C:)</textcolor></indent><indent value=4><endl/>Sul file: <indent value=10><textcolor value="navyblue">"\\Nas\Backup\immaginiacronis\sami\2\samanta.tib"</textcolor></indent><indent value=4><endl/>Compressione: <indent value=10><textcolor value="navyblue">Normale</textcolor></indent><indent value=4><endl/>Descrizione: <indent value=10><endl/><textcolor value="navyblue">"copia backup completo PC il terzo mercoledi del mese"</textcolor></indent><indent value=4><endl/></indent>" module="1" time="1300298404" type="2" />

The operating system is Windows XP SP2.

Both copies are make on a NAS
Thanks
Sincerely
Richard