Just installed W3TC and MaxCDN on my site (Apache server at GoDaddy). Seems to be working fine. However, I backup my site using the ftp add-on in Firefox, and I got a lot of errors similar to this:
550 Can't change directory to/wp-content/w3tc/objectcache/d/c/a: No such file or directory
The .../d/c/a: folder is there with no files inside.
Got about 150 very similar error messages. Bad setting, technique or just a startup anomoly? I contacted MaxCDN first and they said neither netDNA or W3TC require changes in bacup methology.
Thank - John Lawson