Log files, cache files, temporary files, etc - use SSH to figure out which ones.

Hi @Bharat1987

There several factors like @jtittle writes, but the extra data probably comes from various logs, database growth from default WordPress usage, Ubuntu updates.
Ubuntu released two kernel updates the past two weeks - each is 250MB, so unless you remove older updates, then the disk usage will continue to grow.

If you run the following command, it will remove non-dependencies and cleanup old unused updates:

sudo apt-get autoremove && sudo apt-get autoclean

And have a look in /var/log to ensure the logs are not growing out of proportions.

@Bharat1987

The OP didn’t provide an actual size relating to current data versus old, only that it was up by 1GB, so I was providing general information.

Both access and error logs can account for a large chunk of disk usage if you’re not doing log rotation and archiving the older logs.

In the past, I’ve seen log files multiple GB’s in size because proper log rotation was never implemented. It’s not only a disk usage problem, it becomes a performance problem too since those files are constantly opened and closed.

…

Beyond logs, cached files can take up quite a bit of space, especially if you have a site that caches everything to disk instead of RAM and doesn’t invalidate the cache at some point (i.e. delete old objects, data, etc).

…

If you update/upgrade repository packages using apt, yum, dnf, etc – that too consumes disk space as the updates are normally larger than their previous versions. By how much all depends on what all was updated.

This is even more so true because of what @hansen mentioned – the kernel updates are not all that small and rightfully so as they are general use kernels, not specifically tuned for any specific stack in most cases. In most cases, general kernels include the bulk of what is needed for anything to work so the end-user doesn’t have to compile their own.