Mysteriously, our connection is now very slow (10 KiB/s),
so it takes a very long time to download large files (>= 900 MB).
I'm searching for an online service that will:
I tried that with my own VPS and it saves me hours of downloading. Are there any online services that will do this easily?
Most web-servers today implement the gzip compression on the data stream. Perhaps your remote web-server doesn't have that turned on?
Compressing files prior to sending them across the wire will yield little/no improvements on the actual amount of the data going over the wire. Rather than trying to transfer 900mb ... it'd probably be smarter to look at what you're transferring and perhaps look at programs capable of transferring "deltas" rather than the full contents of the files. (transfer what changed vs transferring 100% every time)
I know of no web-services that will do this for you on-the-fly.