Here is the breakdown of the GLBa0.08 data files for a 00Z snapshot (1 day):

2d/archv.YYYY_DDD_00_2d.nc
521,788,000 Bytes [uncompressed] OR
246,421,000 Bytes {compressed}

salt/archv.YYYY_DDD_00_3zs.nc
2,029,076,000 Bytes [uncompressed] OR
643,528,000 Bytes {compressed}

temp/archv.YYYY_DDD_00_3zt.nc
2,029,076,000 Bytes [uncompressed] OR
643,528,000 Bytes {compressed}

uvel/archv.YYYY_DDD_00_3zu.nc
2,029,076,000 Bytes [uncompressed] OR
643,528,000 Bytes {compressed}

vvel/archv.YYYY_DDD_00_3zv.nc
2,029,076,000 Bytes [uncompressed] OR
643,528,000 Bytes {compressed}

=========================================
Totals (approximately):

8,638,092,000 Bytes / day (00Z) [uncompressed] OR
2,820,533,000 Bytes / day (00Z) {compressed}

3,152,903,580,000 Bytes / year (365 days) [uncompressed] OR
1,029,494,545,000 Bytes / year (365 days) {compressed}