external storage on a linode

I host on my linodes some services for my clients, mainly web and email, and until now I didn't have big requirements in term of storage space, but I am currently setting up a web site for a new client that will initially require at least 60GB of space.

I don't have this space available on my linode so this let me think on how I can scale and what solution could I adopt in case I suddenly need more space in cases like this.

The easiest solution would be of course to to upgrade my linode but I can't/won't right now because I should migrate to SSD (I have still the old plan) and my linodes are hosting production services…I need to plan the migration and work on that and unfortunately I don't have the time right now.

Second: this could only be a short term solution as I could face this problem again in the future.

Third: I am hosting a few websites, 20ish, and right now I consume ~50GB of bandwidth per month, load is quite low and ram usage is ok, so I don't really need to upgrade a part from storage need.

Now, I was evaluating taking a physical machine to some external hosting company, but then I thought about Amazon S3. I read some very old comment on very bad performances when mounting S3 as a filesystem, also on linodes. Is there anyone who uses it other than backups? Is it really bad?

What I need to put up there are files that have to be served via http and needs to be always available and possibly also locally on the linode (so with a remotely mounted fs).

Any thought on that?

Also, what about webdav as an alternative? (have storage on an external server mounted with davfs)

Thanks!

C.